【2021.1.21更新】直接使用现成的国内镜像源，执行下面的命令，选1(亲测速度最快)，如果不行，再换成其他源
/bin/zsh -c "$(curl -fsSL https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh)"
【2020-3-21】最近换了Mac,安装Homebrew很慢（以前好像并没有这么慢）,Downloading and installing Homebrew...只有10KB/S.解决方法主要思路是把git切换为清华镜像，话不多说，直接看步骤吧.
1.png
1.用safari打开“https://raw.githubusercontent.com/Homebrew/install/master/install.sh”,把里面的文本复制下来，在桌面创建文本文件“brew_install”,粘贴.
2.搜索:
BREW_REPO="https://github.com/Homebrew/brew"
替换成:
BREW_REPO="https://mirrors.ustc.edu.cn/brew.git"
保存.
3.打开terminal,运行命令:/bin/bash + 刚才的brew_install文件,比如:
/bin/bash /Users/admin/Desktop/brew_install
2.png
4.进入下面的 Taps 目录，clone homebrew-core
cd /usr/local/Homebrew/Library/Taps/homebrew (如果没有homebrew,新建homebrew文件夹)
git clone https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git
5.把homebrew repo切换为清华镜像
cd "$(brew --repo)"
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git
brew update
PS:如果有报错：curl: (7) Failed to connect to raw.githubusercontent.com port 443: Connection refused，可以通过这个命令解决：sudo gem install redis
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